24 Works

Data from: Effects of fleas on nest success of Arctic barnacle geese: experimentally testing the mechanism

Margje E. De Jong & Maarten J.J.E. Loonen
Parasites have detrimental effects on their hosts’ fitness. Therefore, behavioural adaptations have evolved to avoid parasites or, when an individual is already in contact with a parasite, prevent or minimize infections. Such anti-parasite behaviours can be very effective, but can also be costly for the host. Specifically, ectoparasites can elicit strong host anti-parasite behaviours and interactions between fleas (Siphonaptera) and their hosts are one of the best studied. In altricial bird species, nest fleas can...

Data from: Dynamics of deep soil carbon - insights from 14C time series across a climatic gradient

Tessa Sophia Van Der Voort, Utsav Mannu, Frank Hagedorn, Cameron McIntyre, Lorenz Walthert, Patrick Schleppi, Negar Haghipour & Timothy I. Eglinton
Quantitative constraints on soil organic matter (SOM) dynamics are essential for comprehensive understanding of the terrestrial carbon cycle. Deep soil carbon is of particular interest, as it represents large stocks and its turnover times remain highly uncertain. In this study, SOM dynamics in both the top and deep soil across a climatic (average temperature ~1-9 °C) gradient are determined using time-series (~20 years) 14C data from bulk soil and water-extractable organic carbon (WEOC). Analytical measurements...

Data from: Coasting in live-bearing fish: the drag penalty of being pregnant

Elsa M. Quicazan-Rubio, Johan L. Van Leeuwen, Klaas Van Manen, Mike Fleuren, Bart J. A. Pollux & Eize J. Stamhuis
Swimming performance of pregnant live-bearing fish is presumably constrained by the additional drag associated with the reproductive burden. Yet, it is still unclear how and to what extent the reproductive investment affects body drag of the females. We examined the effect of different levels of reproductive investment on body drag. The biggest measured increase in body volume due to pregnancy was about 43%, linked to a wetted area increase of about 16% and 69% for...

Data from: Natal habitat and sex-specific survival rates result in a male-biased adult sex ratio

A. H. Jelle Loonstra, Mo A. Verhoeven, Nathan R. Senner, Jos C.E.W. Hooijmeijer, Theunis Piersma & Rosemarie Kentie
The adult sex ratio (ASR) is a crucial component of the ecological and evolutionary forces shaping the dynamics of a population. Although in many declining populations ASRs have been reported to be skewed, empirical studies exploring the demographic factors shaping ASRs are still rare. In this study of the socially monogamous and sexually dimorphic Black-tailed Godwit (Limosa limosa limosa), we aim to evaluate the sex ratio of chicks at hatch and the subsequent sex-specific survival...

Data from: Earthworm activity and availability for meadow birds is restricted in intensively managed grasslands

Jeroen Onrust, Eddy Wymenga, Theunis Piersma & Han Olff
1. Earthworms are an important prey for the endangered meadow birds of north-west Europe. Although intensive grassland management with high manure inputs generally promotes earthworm abundance, it may reduce the effective food availability for meadow birds through desiccation of the topsoil, which causes earthworms to remain deeper in the soil. 2. We studied the response of Red Worm Lumbricus rubellus, a detritivore, and Grey Worm Aporrectodea caliginosa, a geophage, to soil moisture profiles in the...

Manipulation of photoperiod perception advances gonadal growth but not laying date in the great tit

Lucia Salis, Samuel Caro, Roelof A. Hut, Louis Vernoij & Marcel E. Visser
In seasonal environments, organisms use biotic and abiotic cues to time various biological processes that are crucial for growth, survival and reproductive success. Photoperiod is the best-known cue used to regulate gonadal development, migration and moult of many animal species. In birds, the relationship between photoperiod and gonadal development is clearly established, but we have little understanding on whether photoperiod also regulates actual timing of egg laying under natural conditions. Elucidating the link between photoperiod...

Immuno-competence data

Asmoro Lelono, Diana Robledo-Ruiz, Tom Berghof, Henk Parmentier, Bernd Riestra & Ton Groothuis
The exposure of yolk androgens can positively stimulate chick growth and competitive ability but may negatively affect immunity. It has been hypothesized that only chicks from immunologically superior fathers can bear the cost of prenatal exposure to high androgen levels. To test this hypothesis we paired roosters from two selection lines, one up- and one down-selected for natural antibodies, with hens from a control line. We measured yolk testosterone and androstenedione levels, and we injected...

Data from: Quantifying water requirements of African ungulates through a combination of functional traits

Michiel Veldhuis, Emilian Kihwele, Victor Mchomvu, Norman Owen-Smith, Robyn Hetem, Matthew Hutchinson, Arjun Potter & Han Olff
Climate and land use change modify surface water availability in African savannas. Surface water is a key resource for both wildlife and livestock and its spatial and temporal distribution is important for understanding the composition of large herbivore assemblages in savannas. Yet, the extent to which ungulate species differ in their water requirements remains poorly quantified. Here, we infer the water requirements of 48 African ungulates by combining six different functional traits related to physiological...

A fruit diet rather than invertebrate diet maintains a robust innate immunity in an omnivorous tropical songbird

Chima Nwaogu, Annabet Galema, Will Cresswell, Maurine Dietz & Irene Tieleman
1. Diet alteration may lead to nutrient limitations even in the absence of food limitation, and this may affect physiological functions, including immunity. Nutrient limitations may also affect the maintenance of body mass and key life history events that may affect immune function. Yet, variation in immune function is largely attributed to energetic trade-offs rather than specific nutrient constraints. 2. To test the effect of diet on life history traits, we tested how diet composition...

Data from: Telomere length is repeatable, shortens with age and reproductive success, and predicts remaining lifespan in a long-lived seabird

Coraline Bichet, Sandra Bouwhuis, Christina Bauch, Simon Verhulst, Peter Becker & Oscar Vedder
Telomeres are protective caps at the end of chromosomes, and their length is positively correlated with individual health and lifespan across taxa. Longitudinal studies have provided mixed results regarding the within-individual repeatability of telomere length. While some studies suggest telomere length to be highly dynamic and sensitive to resource-demanding or stressful conditions, others suggest that between-individual differences are mostly present from birth and relatively little affected by the later environment. This dichotomy could arise from...

Data from: Cross-boundary human impacts compromise the Serengeti-Mara ecosystem

Michiel P. Veldhuis, Mark E. Ritchie, Joseph O. Ogutu, Thomas A. Morrison, Colin M. Beale, Anna B. Estes, William Mwakilema, Gordon O. Ojwang, Catherine L. Parr, James Probert, Patrick W. Wargute, J. Grant C. Hopcraft & Han Olff
Protected areas provide major benefits for humans in the form of ecosystem services, but landscape degradation by human activity at their edges may compromise their ecological functioning. Using multiple lines of evidence from 40 years of research in the Serengeti-Mara ecosystem, we find that such edge degradation has effectively “squeezed” wildlife into the core protected area and has altered the ecosystem’s dynamics even within this 40,000-square-kilometer ecosystem. This spatial cascade reduced resilience in the core...

Data from: Small herbivores slow down species loss up to 22 years but only at early successional stage

Qingqing Chen, Ruth A. Howison, Jan P. Bakker, Juan Alberti, Dries P. J. Kuijper, Han Olff & Christian Smit
The long-term influence of persistent small herbivores on successional plant community configuration is rarely studied. We used an herbivore exclusion experiment along the successional gradient in a salt-marsh system, to investigate the effects of hares and geese, and hares alone, on plant diversity at five successional stages (the earliest, two early, the intermediate and the late successional stages) in the short and long term, i.e. 7 and 22 years, respectively. Plant diversity declined over time...

Data from: Ultra-long telomeres shorten with age in nestling great tits but are static in adults and mask attrition of short telomeres

Els Atema, Ellis Mulder, Arie J. Van Noordwijk & Simon Verhulst
Telomere length (TL) is increasingly used as a biomarker of senescence, but measuring telomeres remains a challenge. Within tissue samples, TL varies between cells and chromosomes. Class I telomeres are (presumably static) interstitial telomeric sequences, and terminal telomeres have been divided in shorter (Class II) telomeres and ultra-long (Class III) telomeres, and the presence of the latter varies strongly between species. Class II telomeres typically shorten with age, but little is known of Class III...

Data from: Experimentally induced anti-predator responses are mediated by social and environmental factors

Frank Groenewoud, Sjouke A. Kingma, Kat Bebbington, David Richardson & Jan Komdeur
Nest predation is a common cause of reproductive failure for many bird species, and various anti-predator defense behaviors have evolved to reduce the risk of nest predation. However, trade-offs between current reproductive duties and future reproduction often limit the parent’s ability to respond to nest predation risk. Individual responses to experimentally increased nest predation risk can give insights into these trade-offs. Here, we investigate whether social and ecological factors affect individual responses to predation risk...

Data from: Scrutinizing assortative mating in birds

Daiping Wang, Wolfgang Forstmeier, Mihai Valcu, Niels Dingemanse, Martin Bulla, Christiaan Both, Renée A. Duckworth, Lynna Marie Kiere, Patrik Karell, Tomáš Albrecht & Bart Kempenaers
It is often claimed that pair bonds preferentially form between individuals that resemble one another. Such assortative mating appears to be widespread throughout the animal kingdom. Yet it is unclear whether the apparent ubiquity of assortative mating arises primarily from mate choice (‘like attracts like’) which can be constrained by same-sex competition for mates, from spatial or temporal separation, or from observer, reporting, publication or search bias. Here, based on a conventional literature search, we...

Data from: Phylogeography of Bornean land snails suggests long-distance dispersal as a cause of endemism

Kasper P. Hendriks, Giacomo Alciatore, Menno Schilthuizen & Rampal S. Etienne
Aim: Islands are often hotspots of endemism due to their isolation, making colonization a rare event, and hence facilitating allopatric speciation. Dispersal usually occurs between nearby locations according to a stepping-stone model. We aimed to reconstruct colonization and speciation processes in an endemic-rich system of land-based islands that does not seem to follow the obvious stepping-stone model of dispersal. Location: Five land-based habitat archipelagos of limestone outcrops in the floodplain of the Kinabatangan River in...

Genetic homogeneity in the face of morphological heterogeneity in the harbor porpoise from the Black Sea and adjacent waters (Phocoena phocoena relicta)

Yacine Ben Chehida, Julie Thumloup, Karina Vishnyakova, Pavel Gol'din & Michael Fontaine
Absence of genetic differentiation is usually taken as an evidence of panmixia, but can also reflect other situations including even nearly complete demographic independence among large-sized populations. Deciphering which situation applies has major practical implications (e.g., in conservation biology). The endangered harbor porpoises in the Black Sea illustrates well this point. While morphological heterogeneity suggested that population differentiation may exist between individuals from the Black and Azov seas, no genetic study provided conclusive evidence or...

Data from: No down-regulation of immune function during breeding in two year-round breeding bird species in an equatorial East African environment

Henry Ndithia, Maaike Versteegh, Muchane Muchai & B. I. Tieleman
Some equatorial environments exhibit substantial within-location variation in environmental conditions throughout the year and yet have year-round breeding birds. This implies that breeding in such systems are potentially unrelated to the variable environmental conditions. By breeding not being influenced by environmental conditions, we become sure that any differences in immune function between breeding and non-breeding birds do not result from environmental variation, therefore allowing for exclusion of the confounding effect of variation in environmental conditions....

Data from: Low fitness at low latitudes: wintering in the tropics increases migratory delays and mortality rates in an Arctic breeding shorebird

Jeroen Reneerkens, Tom S.L. Versluijs, Theunis Piersma, Jose Alves, Mark Boorman, Colin Corse, Olivier Gilg, Gunnar Hallgrimsson, Johannes Lang, Bob Loos, Yaa Ntiamoa-Baidu, Alfred Nuoh, Peter Potts, Job Ten Horn & Tamar Lok
1. Evolutionary theories of seasonal migration generally assume that the costs of longer migrations are balanced by benefits at the non-breeding destinations. 2. We tested, and rejected, the null hypothesis of equal survival and timing of spring migration for High Arctic breeding sanderling Calidris alba using six and eight winter destinations between 55° N and 25° S, respectively. 3. Annual apparent survival was considerably lower for adult birds wintering in tropical West-Africa (Mauritania: 0.74 and...

Data from: Sexual size dimorphism, prey morphology, and catch success in relation to flight mechanics in the Peregrine Falcon: a simulation study

Robin Mills, Graham K. Taylor & Charlotte K. Hemelrijk
In common with many other raptors, female Peregrine Falcons Falco peregrinus are about 50% heavier than males. Their sexual dimorphism is thought to allow breeding pairs to exploit a wider range of prey through a division of labor: the male being able to catch more maneuverable prey species; the female capable of carrying larger ones. Given the difficulty of assessing the catch success and load carrying capacity of both sexes of falcon in the field,...

Data from: Visual adaptation and microhabitat choice in Lake Victoria cichlid fish

Daniel Mameri, Corina Van Kammen, Ton G. G. Groothuis, Ole Seehausen & Martine E. Maan
When different genotypes choose different habitats to better match their phenotypes, adaptive differentiation within a population may be promoted. Mating within those habitats may subsequently contribute to reproductive isolation. In cichlid fish, visual adaptation to alternative visual environments is hypothesised to contribute to speciation. Here, we investigated whether variation in visual sensitivity causes different visual habitat preferences, using two closely related cichlid species that occur at different but overlapping water depths in Lake Victoria and...

Data from: Decline in abundance and apparent survival rates of fin whales (Balaenoptera physalus) in the northern Gulf of St. Lawrence

Anna Schleimer, Christian Ramp, Julien Delarue, Alain Carpentier, Martine Bérubé, Per J. Palsbøll, Richard Sears & Philip S. Hammond
Estimates of abundance and survivorship provide quantifiable measures to monitor populations and to define and understand their conservation status. This study investigated changes in abundance and survival rates of fin whales (Balaenoptera physalus) in the northern Gulf of St. Lawrence (GSL) in the context of anthropogenic pressures and changing environmental conditions. A long-term data set, consisting of 35 years of photo-identification surveys and comprising more than 5,000 identifications of 507 individuals, formed the basis of...

Data from: Density-dependent population dynamics of a high Arctic capital breeder, the barnacle goose

Kate Layton-Matthews, Maarten J.J.E. Loonen, Brage Bremset Hansen, Christophe F. D. Coste, Bernt-Erik Sæther & Vidar Grøtan
1. Density regulation of the population growth rate occurs through negative feedbacks on underlying vital rates, in response to increasing population size. Here, we examine in a capital breeder how vital rates of different life history stages, their elasticities, and population growth rates are affected by changes in population size. 2. We developed an integrated population model for a local population of Svalbard barnacle geese, Branta leucopsis, using counts, reproductive data and individual-based mark-recapture data...

Data from: Contagious fear: escape behaviour increases with flock size in European gregarious birds

Federico Morelli, Yanina Benedetti, Mario Diaz, Tomas Grim, Juan Ibáñez-Álamo, Jukka Jokimäki, Marja-Liisa Kaisanlahti-Jokimäki, Kunter Tätte, Gábor Markó, Yiting Jiang, Piotr Tryjanowski & Anders P. Møller
Flight initiation distance (FID), the distance at which individuals take flight when approached by a potential (human) predator, is a tool for understanding predator-prey interactions. Among the factors affecting FID, tests of effects of group size (i.e. number of potential prey) on FID have yielded contrasting results. Group size or flock size could either affect FID negatively (i.e. the dilution effect caused by the presence of many individuals) or positively (i.e. increased vigilance due to...

Registration Year

  • 2019

Resource Types

  • Dataset


  • University of Groningen
  • Nederlands Instituut voor Ecologie
  • Wageningen University & Research
  • Max Planck Institute for Ornithology
  • Centre d'Ecologie Fonctionnelle et Evolutive
  • University of Hohenheim
  • Princeton University
  • University of Aveiro
  • University of Glasgow
  • University of Lisbon